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| Section | Weight | Objectives |
|---|---|---|
| 5G Network Planning and Design | 30% | - Coverage Planning
|
| 5G Network Testing and Troubleshooting | 15% | - Testing Methods
|
| 5G Network Optimization | 35% | - Performance Analysis
|
| 5G Radio Network Planning Fundamentals | 20% | - Radio Propagation and Coverage Principles
|
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NEW QUESTION # 34
Which of the following MCS indices is required for 256QAM scheduling in downlink peak-rate testing?
Answer: A
Explanation:
MCS index 27 is the expected answer because it represents the highest non-reserved spectral-efficiency entry in the conventional NR PDSCH MCS table supporting 256QAM.
The Modulation and Coding Scheme (MCS) determines the modulation order and target coding rate used for scheduled data transmission.
For 256QAM, the modulation order is Q_m=8, meaning eight coded bits are mapped to each modulation symbol.
According to 3GPP TS 38.214, Table 5.1.3.1-2, MCS index 27 uses modulation order 8 and a target coding- rate parameter of 948/1024.
Its spectral efficiency is approximately 7.4063 bits per resource element before applicable resource overheads.
This makes index 27 particularly relevant when evaluating maximum downlink throughput under favorable radio conditions.
However, an important distinction exists between enabling 256QAM and achieving maximum spectral efficiency.
MCS index 23 also uses 256QAM, with a target coding-rate parameter of 797/1024 and a lower spectral efficiency of approximately 6.2266.
Therefore, both indices 23 and 27 can represent 256QAM modulation, but index 27 provides the higher nominal spectral efficiency.
MCS index 28 is reserved in the referenced table, while index 32 is outside the five-bit MCS index range.
Consequently, B is correct for maximum peak-rate testing.
Official Reference: 3GPP TS 38.214, Section 5.1.3.1, Table 5.1.3.1-2, MCS Index Table 2 for PDSCH .
Technical warning / qualification: Option D also represents 256QAM. The question is unambiguous only if peak-rate testing means selecting the highest non-reserved spectral-efficiency entry. The wording should explicitly state this condition.
NEW QUESTION # 35
Which of the following timers is specific to 5G networks?
Answer: B
Explanation:
T319 is the correct answer because it is defined in the 5G New Radio (NR) Radio Resource Control (RRC) specification to supervise the RRC connection resume procedure.
5G NR supports three principal RRC states: RRC_IDLE, RRC_CONNECTED, and RRC_INACTIVE. The RRC_INACTIVE state allows a UE to retain its Access Stratum (AS) context while reducing signaling overhead and power consumption.
When a UE in RRC_INACTIVE needs to resume communication, it initiates the RRC connection resume procedure by transmitting an RRCResumeRequest or RRCResumeRequest1 message. Timer T319 supervises this procedure.
If the UE receives an appropriate RRCResume message, T319 is stopped, and the UE restores the relevant radio-bearer configuration and transitions to RRC_CONNECTED.
If T319 expires before successful completion, the UE performs RRC resume failure handling and enters RRC_IDLE.
The remaining timers are also present in LTE:
T300: Supervises RRC connection establishment.
T310: Supports radio-link failure detection.
T311: Supervises cell selection during RRC connection reestablishment.
Therefore, among the listed options, T319 is specifically associated with the NR RRC connection resume procedure.
Official Reference: 3GPP TS 38.331, Sections 5.3.13.3-5.3.13.5, RRC Connection Resume , and Section
7.1.1, RRC Timers .
NEW QUESTION # 36
When multiple slices exist in the 5GC, which of the following modules is responsible for selecting a slice?
Answer: B
Explanation:
The Network Slice Selection Function (NSSF) is the dedicated 5G Core network function responsible for supporting network-slice selection.
Network slicing enables operators to create multiple logical networks on common infrastructure, allowing differentiated service capabilities for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC).
Each network slice is identified using Single Network Slice Selection Assistance Information (S-NSSAI), consisting of a Slice/Service Type (SST) and an optional Slice Differentiator (SD).
During UE registration, the Access and Mobility Management Function (AMF) processes the requested slice information and may interact with the NSSF through the Nnssf service-based interface.
The NSSF assists with determining the Allowed NSSAI, identifying suitable network-slice instances, and determining appropriate AMF sets for the requested slices.
The remaining network functions have distinct responsibilities.
AMF manages UE registration, access authorization coordination, and mobility management. Although it participates in slice-selection procedures, it is not the dedicated slice-selection function.
NRF provides network-function registration and discovery services.
NEF securely exposes network capabilities and events to authorized external applications.
Therefore, NSSF is the correct answer because network-slice selection is explicitly included in its standardized functional responsibilities.
Official Reference: 3GPP TS 23.501, Sections 5.15 and 6.2.14, Network Slicing and NSSF Functionality .
NEW QUESTION # 37
Which of the following parameters relate to open-loop power control for PUCCH power control?
Select All that Apply
Answer: A,B,D
Explanation:
Options A, B, and C are the intended answers because the 5G NR Physical Uplink Control Channel (PUCCH) transmit-power calculation depends on subcarrier spacing, allocated radio resources, and format-dependent control-information characteristics.
PUCCH carries Uplink Control Information (UCI), including HARQ acknowledgments, Scheduling Requests (SR), and Channel State Information (CSI).
PUCCH power control combines open-loop parameters with dynamically accumulated closed-loop Transmit Power Control (TPC) adjustments.
The open-loop component establishes a transmission-power baseline using configured power offsets, downlink path-loss estimation, and the transmission-resource configuration.
Option A - PUCCH SCS: Subcarrier spacing contributes to the bandwidth-dependent term of the PUCCH transmit-power formula.
Option B - UCI format: The intended concept concerns PUCCH format and UCI payload-dependent adjustments. Different PUCCH formats have different symbol structures, payload capacities, and associated power-adjustment requirements.
Option C - Number of RBs: The allocated PUCCH Resource Blocks affect transmission bandwidth and the corresponding power calculation.
Option D - PUCCH MCS: Unlike PUSCH, PUCCH power control does not use a conventional PUCCH MCS index as an independent open-loop power-control parameter.
Consequently, options A, B, and C correctly identify the relevant factors in the intended examination context.
Official Reference: 3GPP TS 38.213, Section 7.2.1, PUCCH Transmit Power ; TS 38.331, PUCCH- PowerControl Configuration .
Technical warning / qualification: The original option B states UCI format . The standards use the more precise concepts of PUCCH format and UCI payload-dependent adjustments. For technical accuracy, this option should be revised before publication. The original wording has been preserved above.
NEW QUESTION # 38
Which of the following statements regarding throughput-related indicators is incorrect?
Answer: A
Explanation:
Option A is incorrect under the standardized burst-based throughput measurement methodology because including the final small transmission interval can distort the measured throughput.
In NR performance management, throughput measurements are intended to represent radio transmission performance rather than the average application traffic rate across periods containing idle time.
The relevant measurement procedure distinguishes intervals during which the transmission buffer contains data from intervals when the buffer becomes empty.
The final transmission interval of a data burst may carry only a small residual packet. Including its duration and data volume can introduce a packet-size-dependent effect into the calculated throughput.
3GPP TS 28.554 therefore defines an extended throughput measurement method that excludes the final slot of the burst from the applicable calculation.
Option B is correct because average uplink and downlink UE throughput are used to assess radio-network performance as experienced by users.
Option C describes the general relationship between transmitted data volume and applicable active transmission time, subject to the precise measurement definitions.
Option D expresses a comparable throughput relationship at cell level, although its wording is less precise than the standardized KPI definitions.
Therefore, option A contradicts the specified throughput methodology.
Official Reference: 3GPP TS 28.554, Section 6.3.6.2, Extended Definition of Throughput , Figure 1; TS
28.552, 5G Performance Measurements .
NEW QUESTION # 39
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